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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Thermal and Chemical Activation of High Flyash Content Cement Based Materials
Author(s): S. Mane and b. Mobasher
Publication: Special Publication
Appears on pages(s): 303-323
Keywords: activators, flyash, fracture mechanism, hydration, physical and chemical activation, toughness
Abstract:An experimental study was conducted to evaluate the mechanical properties of mortar containing flyash subjected to both thermal and chemical activation. Mortar specimens containing class F. flyash and various activators were prepared. Up to 50% by weight of cement was replaced with flyasha dn the results were compared with the control mixture. IN order to activate the gydration reafctions, additives such as sodium hydroxide (NaOH) and potassium hydroxide (KOH) were used at a rate of 2.5 % of total binder weight. Thermal activation was achieved using an autoclave curing process. Both the strengthening and toughening mechanisms were studied in compression, flexure. The fracture results are analyzed using the fracture energy method, the two -parameter facture properties remain virtually at the same level. R-Curves provide a more descriptive measure of fracture response. Autoclave curing of high flyash mortar samples results in a mrked increase in the strength but a marginal reduction in ductility.
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